wareyin
Penultimate Amazing
She could have known if he followed her from the bar to the elevator even if he were wearing a full scramble suit.
The talk is irrelevant if he was listening to her holding forth in the bar.
It's amusing how tightly you are grasping those straws. If he followed her from the bar to the elevator, one of her friends would have seen him. If she knows he was listening to her holding forth in the bar, then there was some way she had to identify him. Sadly, that identifying characteristic somehow disappears when she looks at photos of the people in the bar, or describes who he was to the other people she was with in that small, relatively empty bar for hours.
Unless the guy was a ninja. Then, all bets are off. Maybe he was clinging to the ceiling, strategically avoiding every camera snap, unnoticed by everyone at her table, able to follow her unseen to the elevator even though she was loudly talking about her plans to her friends as she was walking to that elevator.